Wikipedia: search=ana wrote: Hinton created several new words to describe elements in the fourth dimension. According to OED, he first used the word tesseract in 1888 in his book A New Era of Thought. He also invented the words "kata" (from the Greek "down") and "ana" (from the Greek "up") to describe the two opposing fourth-dimensional directions—the 4-D equivalents of left and right, forwards and backwards, and up and down.
When they say its ("ana" and "kata" the 4D equivalent to leftright forewards backwards up and down, they just mean its perpendicular to all of them right? are they just the extra dimension of the 4D? (if it is then i know what they're talking about and they worded it badly -_-)